<!doctype html>
<html lang="en">
	<head>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, initial-scale=1">
		<title>Template • TodoMVC</title>
		<link rel="stylesheet" href="node_modules/todomvc-common/base.css">
		<link rel="stylesheet" href="node_modules/todomvc-app-css/index.css">
		<!-- CSS overrides - remove if you don't need it -->
		<link rel="stylesheet" href="css/app.css">
	</head>
	<body>
		<section class="todoapp" id="todoapp">
			<header class="header">
				<h1>todos</h1>
				<input class="new-todo" placeholder="What needs to be done?" v-app-focus  @keyup.enter="addItem">
			</header>
			<!-- This section should be hidden by default and shown when there are todos -->
			<!-- 如果items.length为0的时候 就不会显示 -->
			<!-- 如果要结合template进行页面显示，需使用v-if进行配合 -->
			<!-- 为什么不推荐用div，因为使用div可能会改变当前的页面布局 -->
			<template  v-if="items.length!=0" >
				<section class="main">
					<input v-model="toggleAll" id="toggle-all" class="toggle-all" type="checkbox">
					<label for="toggle-all">Mark all as complete</label>
					<ul class="todo-list">
						<!-- These are here just to show the structure of the list items -->
						<!-- List items should get the class `editing` when editing and `completed` when marked as completed -->
						<li v-for="(item,index) in items" :class="{completed:item.completed,editing:item === currentItem}">
							<div class="view">
								<!-- 因为状态需要更改所以用双向绑定v-model -->
								<input class="toggle" type="checkbox" v-model="item.completed">
								<label @dblclick="toEdit(item)">{{item.content}}</label>
								<!-- 因为删除的id不会进行更改所以使用:value -->
								<button class="destroy" :value="item.id" @click="removeItem(index)" ></button>
							</div>
							<input v-app-focus="item === currentItem" class="edit" @keyup.enter="finishEdit(item,index,$event)" @blur="finishEdit(item,index,$event)" @keyup.esc="cancelEdit" :value="item.content">
						</li>
					</ul>
				</section>
				<!-- This footer should be hidden by default and shown when there are todos -->
				<footer class="footer">
					<!-- This should be `0 items left` by default -->
					<!-- 如果未完成的item为1则没有s,除此之外都有s -->
					<span class="todo-count"><strong>{{reamaing}}</strong> item{{reamaing === 1 ? '' : 's'}} left</span>
					<!-- Remove this if you don't implement routing -->
					<ul class="filters">
						<li>
							<a class="selected" href="#/">All</a>
						</li>
						<li>
							<a href="#/active">Active</a>
						</li>
						<li>
							<a href="#/completed">Completed</a>
						</li>
					</ul>
					<!-- Hidden if no completed items are left ↓ -->
					<!-- 如果有已完成的任务则显示，否则不显示 -->
					<button v-show="items.length > reamaing" @click="removeCompleted" class="clear-completed">Clear completed</button>
				</footer>	
			</template>
		</section>
		<footer class="info">
			<p>Double-click to edit a todo</p>
			<!-- Remove the below line ↓ -->
			<p>Template by <a href="http://sindresorhus.com">Sindre Sorhus</a></p>
			<!-- Change this out with your name and url ↓ -->
			<p>Created by <a href="http://todomvc.com">you</a></p>
			<p>Part of <a href="http://todomvc.com">TodoMVC</a></p>
		</footer>
		<!-- Scripts here. Don't remove ↓ -->
		<script src="./node_modules/vue/dist/vue.js"></script>
		<script src="node_modules/todomvc-common/base.js"></script>
		<script src="js/app.js"></script>

	</body>
</html>
